Journal
ADVANCES IN OPTICS AND PHOTONICS
Volume 1, Issue 2, Pages 238-278Publisher
Optica Publishing Group
DOI: 10.1364/AOP.1.000238
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Funding
- UK Engineering and Physical Sciences Research Council (EPSRC)
- University of Glasgow
- Perimeter Institute for Theoretical Physics
- Government of Canada through Industry Canada
- Province of Ontario through the Ministry of Research Innovation
- Royal Society
- Wolfson Foundation
- University of Strathclyde
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It is a fundamental consequence of the superposition principle for quantum states that there must exist nonorthogonal states, that is, states that, although different, have a nonzero overlap. This finite overlap means that there is no way of determining with certainty in which of two such states a given physical system has been prepared. We review the various strategies that have been devised to discriminate optimally between nonorthogonal states and some of the optical experiments that have been performed to realize these. (C) 2009 Optical Society of America
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